| 摘要 |
A nail structure has a wall nail casing and a hammer nail. The center of the wall nail casing is formed with a tapered central axial hole. In manufacturing the wall nail casing, an interior and a distal end of a mold for forming the wall nail casing are installed coaxial pins. When the wall nail casing is formed, two ends of the nail body are supported by coaxial pins; and thus the central axial hole will not shift. When the wall nail casing is formed, the distal end thereof is exactly formed with a though hole which is communicated with the central axial hole. When the hammer nail is beaten into the central axial hole of the wall nail casing, the hammer nail expands the central axial hole outwards to prevent the hammer nail from colliding the distal end of the wall nail casing.
|
